PS21: Knock Sensor Test

NOTE: The COOLER button must be held for the duration of the test. If knock sensor activity is detected anytime during the test, the display will change to "11" and the test will be suspended. If the end of the test is reached and no knock sensor activity was detected, the display will change to "22".

Knock Sensor Test. PS21 may be used to test the knock sensor system. The following conditions must be met to test the knock sensor system:

Transaxle in 4th gear
Throttle angle greater than 33.6°
Coolant temperature greater than 80°C

When PS21 is selected, the display will alternate between "--" for one second and "99" for five seconds. If the COOLER button is pressed and held, the display will change to "00" and the following chain of events will be set in action:

TCC will be engaged
3 seconds elapse
Spark advance will be ramped up to 21° and held there for 7.4 seconds